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#include "PieRound.h"
#include "PieChartScene.h"
PieRound::PieRound(const QPointF& center, const PieChartScene* scene):
scene(scene)
{
setPos(center);
calculateSum();
addSectors();
}
QRectF PieRound::boundingRect() const
{
return QRectF(-Radius, -Radius, 2 * Radius, 2 * Radius);
}
void PieRound::calculateSum()
{
sum = 0;
foreach(DataPoint point, scene->getDataSet())
sum += point.value;
}
void PieRound::addSectors()
{
qreal angle = -90;
for(int i = 0; i < scene->getDataSet().size(); i++)
{
qreal sweep = 360. * scene->getDataSet()[i].value / sum;
addSector(i, angle, sweep);
angle += sweep;
}
}
void PieRound::addSector(int index, qreal startAngle, qreal sweep)
{
addSectorItem(createSectorPath(startAngle, sweep),
QColor(scene->getColors()[index]));
addSectorLabel(index, startAngle, sweep);
}
QPainterPath PieRound::createSectorPath(qreal startAngle, qreal sweep)
{
QPainterPath sectorPath;
sectorPath.arcTo(boundingRect(), -startAngle, -sweep);
sectorPath.lineTo(QPointF());
return sectorPath;
}
void PieRound::addSectorItem(const QPainterPath& path, QColor color)
{
QGraphicsPathItem* sectorItem = new QGraphicsPathItem(path, this);
sectorItem->setPen(QColor("white"));
sectorItem->setBrush(color);
}
void PieRound::addSectorLabel(int index, qreal startAngle, qreal sweep)
{
int value = scene->getDataSet()[index].value;
if(value == 0)
return;
QGraphicsSimpleTextItem* labelItem =
new QGraphicsSimpleTextItem(QString::number(value), this);
labelItem->setPos(getLabelPos(startAngle, sweep, labelItem));
}
QPointF PieRound::getLabelPos(qreal startAngle, qreal sweep,
QGraphicsSimpleTextItem* labelItem)
{
int radius = sweep > 30 ? LabelRadius : 2 * LabelRadius;
QRectF labelArcRect(-radius, -radius, 2 * radius, 2 * radius);
QPainterPath path;
path.arcMoveTo(labelArcRect, -startAngle - sweep / 2);
QSizeF labelSize = labelItem->boundingRect().size();
return path.currentPosition() -
QPointF(labelSize.width() / 2, labelSize.height() / 2);
}
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